Emission does not show light haze with Cycles
Haze will not appear by magic, you have to put it there. It is not a quality of the object, but one of the environment where the lights are.
Even though we live in very polluted world, where there are so many suspended particles floating in the air, in the world of blender the air is totally clean and transparent.
Light in the air is only visible if you make it travel in an environment that simulates small particles floating. Such simulation is done by creating an environment with volume scattering.
In the world settings you can add volume scatter as volume material for the whole scene, or you have to create a large mesh that uses volume scatter as volume.
For more details read:
Atmospheric lighting in cycles
and
How do volume shaders interact with light?